Data / Median Air Quality Index (US EPA) / Marshall County

Median Air Quality Index (US EPA) in Marshall County

Median Air Quality Index (US EPA) in Marshall County was 30 in 2005, according to the U.S. Environmental Protection Agency. That is down 8 from 2004. That is the 19th highest of 19 counties in 2005.

2005, index30
Change on 2004-8
Rank19th of 19Counties in Mississippi ranked

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Median Air Quality Index (US EPA) in Marshall County, 2004 to 2005

3032343638200420052004: 38 index2005: 30 index3032343638200420052004: 38 index2005: 30 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 2 values
Periodindex
200530
200438

Marshall County compared with nearby places

Adams County: 50 indexBolivar County: 56 indexDeSoto County: 53 indexForrest County: 58 indexGrenada County: 57 indexHancock County: 55 indexHarrison County: 60 indexHinds County: 59 indexJackson County: 52 indexJones County: 60 indexLauderdale County: 50 indexLee County: 58 indexLowndes County: 56 indexMarshall County: 30 indexPearl River County: 55 indexRankin County: 46 indexScott County: 55 indexWarren County: 55 indexYalobusha County: 39 index
  • Under 50
  • 50 to 55
  • 55 to 56
  • 56 to 58
  • 58 and over
  • No data
Median Air Quality Index (US EPA), 2005, index. Marshall County is outlined. Same source and period for every area shown. Source: U.S. Environmental Protection Agency. Boundaries: U.S. Census Bureau cartographic boundary files.

Rankings

Definition

Median of the daily Air Quality Index (AQI) values of a US county over the days of the year with an AQI, from the EPA AirData annual summaries.

More on how it is measured
  • The daily county AQI is the highest AQI among the monitors and pollutants reported that day (ozone, PM2.5, PM10, carbon monoxide and nitrogen dioxide).
  • Lower is cleaner: 0 to 50 is good, 51 to 100 moderate and above 100 unhealthy for sensitive groups.

United States counties with air quality monitors only, about 1,000 of some 3,100 in recent years; a county without monitors has no value. The number of days with an AQI differs between counties because some monitors run only in the ozone season.

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How to cite

U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Environmental Protection Agency. (2026). EPA AirData annual AQI by county: median daily AQI (Median Air Quality Index (US EPA), Marshall County, 2004 to 2005) [Data set]. Retrieved October 12, 2026, from https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual

MLA 9

EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Marshall County, 2004 to 2005. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/median-air-quality-index/marshall-county-mississippi. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: median daily AQI. Median Air Quality Index (US EPA), Marshall County, 2004 to 2005. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/median-air-quality-index/marshall-county-mississippi.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Marshall County, 2004 to 2005 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/marshall-county-mississippi (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2005,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Marshall County, 2004 to 2005}},
  year = {2026},
  howpublished = {Data set},
  url = {https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/marshall-county-mississippi. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. https://aqs.epa.gov/aqsweb/airdata/download\_files.html\#Annual. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Environmental Protection Agency
TI  - EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Marshall County, 2004 to 2005
PY  - 2026
DA  - 2026/07/13
PB  - U.S. Environmental Protection Agency
DB  - Invokely
UR  - https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual
L2  - https://invokely.ai/en/median-air-quality-index/marshall-county-mississippi
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/marshall-county-mississippi.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -
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Questions

What is the median Air Quality Index (US EPA) in Marshall County?

Median Air Quality Index (US EPA) in Marshall County was 30 in 2005, according to the U.S. Environmental Protection Agency. That is down 8 from 2004. That is the 19th highest of 19 counties in 2005.

Where does this figure come from?

U.S. Environmental Protection Agency. EPA AirData annual AQI by county: median daily AQI. Retrieved by Invokely on 2026-10-12.

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